并联电容器的继电保护装置及改进研究

Study on relay protection device of shunt capacitor and its improvement

并联电容器是电力系统中广泛应用的一种重要无功补偿设备。文章对并联电容器的保护原理进行介绍,分析了传统继电器保护方式下,对双星形接线的不平衡电流保护和桥式差电流保护中发生的平衡性故障无法给予保护原因,给出了针对三相电流变化的比较、判断,克服了上述缺陷。

Shunt capacitor is an important reactive power compensation equipment widely used in power system.The protection principle of shunt capacitor is introduced in this paper,and the traditional relay protection mode is analyzed.The reason why the unbalanced current protection of double star connection and the balance fault of bridge differential current protection can not be protected is given.The comparison and judgement of three-phase current change are given,and the above defects are overcome.